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Avatar universal

could I conceived in December

so I'm in a bit of a pickle! ill try to make this as short as possible but give all important info! okay I need help determining my conception date which I know there is no way of knowing the exact day but I need a little help. I've been with my boyfriend for almost 2 years now but I got a bit drunk one night and had sex with an ex (only happened once and he does know about it) still feel horrible!! but anywho he did use protection but when we got done we noticed the condom had fallen off! this was December 12 and that was the only time. my boyfriend forgave me and been with my boyfriend ever since. (my boyfriend and I have had unprotected sex after the other guy and ever since) anyways i did have a period December 24 but I spotted right before I had it for like 2-3 days which has never happened and the reason why I'm concerned. found out I was pregnant on jan 25. went to the dr 2/5 and all visible on ultrasound was a sack which the sack measured big (about 7 weeks) but dr said I was only about 5-6 weeks. 2/20 baby measured 7 weeks +. 4/24 baby measured 17 weeks. and on 5/22 baby measured 21 weeks+.could I conceived on December 12th? any chance at all?  if anyone could help me out that would be great! thank you and god bless!!
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Avatar universal
thank u!!
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134578 tn?1693250592
COMMUNITY LEADER
Sometimes people do have spotting before their periods, but it is not an indication of pregnancy if all of your ultrasounds point to conception no earlier than early January.
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Avatar universal
okay thank you so very much! so in other words I did not conceive December 12 or at least it is very very unlikely? I'm confused as to why I spotted before my period on Dec 24 because I'm always very regular.
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134578 tn?1693250592
COMMUNITY LEADER
Usually if you had an ultrasound really early (and 5-6 weeks is definitely that) you would use that ultrasound for dating conception.  The one on February 20 where you were in your seventh week would also do, for trying to estimate when conception might have been.  Later ultrasounds have a bigger margin for error when used to try to date the pregnancy, but not early ones.

For a due date of October 6, your most likely conception date would have been January 13.  Even if you got your due date of September 30 in a much later ultrasound, the likely conception date from that would be January 7.  Neither of those has anything to do with December 12.  


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Avatar universal
my first visit due date was Oct 6 but now it's sept 29. I'm 30 weeks today
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134578 tn?1693250592
COMMUNITY LEADER
With all of those ultrasounds, what estimated due date has the doctor given you?  And is it the same one each time?  
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